Clock



FIG. 1 is a front isometric view of a clock showing our new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a cross-sectional view thereof as taken from line 3--3 of FIG. 1;

FIG. 4 is a right elevational view thereof on a reduced scale. 

The ornamental design for a clock, substantially as shown and described. 